Won’t happen here, thanks to the millions of obese people who still smoke in the US, a large percentage from “protected groups.”
Don't underestimate the power of fascist socialist systems, they'll find a way. Does Venezuela have a problem with overweight voters (no, the food shortages are eliminating those issues)? Does the government have a problem with the way anyone there votes?
It's not that cut-and-dry anyway. If you study actuarial tables, the costs imposed on society by obese smokers who die young (and therefore never reach the peak age for health care dependency) have to be balanced against the cost of "subsidizing" unproductive (not working due to age) retirees who have chronic age-related issues and live decades longer.